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    SubjectRe: lowlatency-2.2.14-B1 + 2.2.14aa7 fixes crash, but...

    On Tue, 15 Feb 2000, William Montgomery wrote:

    > all FAILED hunks except in entry.S for the following code snippit:
    > -----part of entry.S.rej-------
    > testl $(VM_MASK),EFLAGS(%esp)
    > movl %esp,%eax
    > jne v86_signal_return
    > xorl %edx,%edx
    > + #else
    > + pushl $0
    > + pushl %eax
    > + #endif
    > call SYMBOL_NAME(do_signal)
    > + addl $8,%esp
    > + #endif

    > I think I can fix the FAILED hunk but I would feel more confident if I
    > knew what this code was doing. Can you give a brief explanation of
    > the ikd additions in this area?

    thats a workaround i added ages ago - we switch off the FASTCALL macro
    (regparm calling-convention extension of GCC which passes up to 3
    parameters through %eax, %edx, %ecx) - in the IKD case the parameters go
    through the stack, in the non-IKD case edx (second parameter) is zeroed,
    eax is passed in as-is.

    IKD triggered problems (likely bugs in previous GCC versions) if regparm
    was used together with -pg (GCC's function-prologue profiling extension
    calling _mcount). mcount() is the basis of the majority of IKD
    'anti-lockup' and tracing features.


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